Could you explain what happened more?
4,000 companies were accepted but 11,000 received acceptance emails?
4,000 companies were accepted but 11,000 received acceptance emails?
http://time.com/3637980/college-admissions-mistakes-johnshop...
It actually happens dozens of times per year on a one-off basis, usually with college coaches telling recruits they've been accepted when the admissions office has only provisionally accepted them.
I'm going to also guess and say user accounts were created in a not easily rolled back way after the fact.
It's been a pretty tough day here at YC but we're all really happy with the final decision we came to!